Directional characteristics of radiation reflection on rough metal surfaces with description of heat transfer parameters
✍ Scribed by Toshiro Makino; Hidenobu Wakabayashi; Shin-ya Okada
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 164 KB
- Volume
- 31
- Category
- Article
- ISSN
- 1099-2871
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✦ Synopsis
Abstract
In this paper we clarify directional characteristics of thermal radiation reflection on rough metal surfaces and establish a technique for determining the parameters for heat transfer computation of radiation energy exchange among surfaces. Directional distribution of bidirectional reflectance ρ of surfaces of root‐mean‐square roughness Σ = 0.1 to 1 µm to the irradiation of a visible laser of wavelength λ = 0.6328 µm and to that of an infrared laser of λ = 3.39 µm is investigated experimentally. The optical roughness (Σ/λ) ranges from 0.028 to 1.27. A measure of the magnitude of specular reflection is presented. A model for describing the ρ distribution is presented, and the experimental results of the ρ distribution are analyzed quantitatively and systematically to determine the values of the specular reflection component R~s~ and the perfect‐diffuse reflection component R~d~ of the hemispherical reflectance R~H~, which are input parameters for radiation heat transfer computation. © 2002 Scripta Technica, Heat Trans Asian Res, 31(2): 76–88, 2002; DOI 10.1002/htj.10008